About the author

Ma Yajiada, Chief Engineer at Hebei Yajiada Import and Export Co., LTD. 20 years experience in flange metallurgy (Cangzhou, Hebei since 2006). Specializes in ASME B16.5 / B16.47 / EN 1092-1 standards and PED 2014/68/EU compliance.
B.Sc. Materials Engineering (Yanshan University); PED 2014/68/EU Module H Notified Body auditor; 20 years flange metallurgy specialization.

Editorial review: Ma Yajiada, PE. Article published 2026-08-01. Last updated 2026-07-28.